Core drawing device



DeC 23, 1941-A N. M. GoLDBoRG x-:rAL 2,266,751

CORE DRAWING DEVICE Filed April 13, 1940 3 sheets-sheet 1 Eg-i- WIW ||||||1 W lum f V Z /4 I ::uum 52\ 50g 65 L 44? 1 www 1 y f' 44"| z' y /2 mln 40' Il' Z,

4f Uumlml D611 23, 1941 N. M. GoLDBoRG' ETAL l 2,256,751

' GORE DRAWING DEvIc'E I Filed April 13, 1940 5 Sheets. sheet 2 I Dec. 23, 1941. N. M. GoLDBoRG E1- AL' 2,266,751

l J CORE DRAWING DEVICE Filed April 13, 1940 :s sheets-sheet 5 y 'llllllllmu-Illllllll` 32C F/a E@ 2J Patented Dec. 23, 1941 UN ITE D" PTENT 0 FF ICE 2,266,752.l Goan DRAWINGDEVICEY Neil M. Goldberg and (blaf H; Skoglund, Hopkins,

and Louis W. Williamson, Minneapolis-Minn.,

assignors to MinneapoliseM'oline Power Implement. Company, Minneapolis, Minn., a corporationfof Delaware SlGlaims.

Thisinvention relates. to a device. for support'- ing, manipulating and drawing sand cores such as. usedv in. foundry workt n The primary object of the invention is to provide a simple, compact and efficient machine or device bythe use ofwhich a.A core box may be supported in position: for blowing ory forming the core, turned over therefrom,. and theV core then drawn .fromI the. box; all such. convenient and easy'man-ner thatone man may carry out thefoperaticn-no matter howv large the core: may

be.; AY further' object is` tov-provide a machine of thisfkind whichvmaybe readily arranged as an attachment lfor aco-re blowing .machine lto greatly facilitate theoperation-thereof, but which may A.

also be' used as: an entirely separate turn-over L and draw machine in molding and core -making Still' a further objects is to' provide a machine having numerousv advantageous :fea-tures of construction and operation: as will appear in the 5...

Fig. lis a frontal" elevationv of our core drawing device arrangedas anV attachment; for a conventional coreblowing machine and,- with the core box show-n as in position for entrance' into the machine.

2-2 in Fig; 1, and also showingthecore drawing device in dotted lin-es as swung into the machine in position for blowing a' core'.

Fig. 3 isa fro-nt View` of the'.assemblyshowing?-4 the core drawing device. swung into the machine andy with an upper portion. of'. the`A latter broken away. f

Fi'g. 4' is a detail perspective View of 'the tapered Fig. 5'is a fragmentary detail elevation showing a core 'drawn-by the devicer Fig. 6* is a fragmentary detail side view, par-fm 4v:1.ok Fig. 2 is a horizontal". section along. the lin'el x tially in section, showing a drier plate placed on the core-ready for drawing.

Fig. 7 is an enlarged1x vertical:l cross section through one side of the core drawingI device showing the anti-frictionroller mounting therein. g

Fig. 8- is a fragmeniary elevation` of the rear portion of the blower machine table showing the latch mechanism for retaining the coreV boi;` in alignment therewith.

Referring now more particularly andbyl refera;

vported thereabove by upright posts |21.'

pin or wedge used for locl'n'ng the drier plate on the core previous toiteubengr turned over and drawn.

ence characters tothe drawings, designates generally' a core blowing machine with which is used ourV core drawing device E. It isv to be understood, however, that our device may be used as: well. as an entirely separate and distinct machine or in'combination with other foundry equipment as may be desired or found'expedient.

The core blowing machineA isof' conventional forml and' includes a base I-l and a head II sup- The table I 3, upon which the core boX is usually placed or clamped, is movable in a vertical direction by air pressure in order tolift the boxinto` sealing engagement with the blower plate I4" on the overhead sand container I5. In this position sand is blown from container I5 by compressed air into the core box and the b-oX is then lowered by causing the table I3 to descend. The box maythen be removed for drawing the core and placingit upon adrier plate and transfer to the usual rack. The sand is contained usual-ly in a hopper Ili'beneath` which the container I5 may be shifted for periodic refilling therefrom.r The foregoing is the usual operation of such machinos, but it'will be apparent that the operation of removingthe core boxfrom the machinefor drawing is one consuming considerable timeand where thebox. and core are heavy itis a laborious undertaking at best.

Turning nowto the construction of the turnover and draw device B, the same in the form illustrated is seen to comprise two main unitsthe core box carrier member or frame I1 and the supporting. or mounting frame I8. The latter, forming as it does the base upon which other parts are mounted, will be described iirst.

A rigid back` or cross member t9 carries at its vertical, transversely spaced sides the guide and roller boxes or members 20 in which are mounted for. vertical reciprocating movement the posts ZI. The lower ends of these posts are rigidly connected to and carried upon the ends of a crosshead or yoke 22 having an intermediate upwardly arched. portion 23 secured` to the plunger 2.4 of` a lifting jack 25. The cylinder 2f: of thisy jack 25' is supported upon a lower foot portion 2l. of.. the back member I9, and air under pressureA may be admitted to the cylinder by' air line. 28 to raise. the posts 2| upon the yoke 2'2. Relief of the air pressure will of course lower this assembly as will be understood.

arranged within the members. 2Il` are inner rollersfZShaving concaved faces for engaging and sapporti-ngA the posts 2l (see Fig. 7) andrv these rollers are mountedv upon. eccentric pins 30 in posts 2| such manner that, by turning the pins, the rollers may be shifted toward the posts to take up wear. Outer, straight rollers 3| are also provided in the members 20 and project at opposite sides therefrom through slots 32 dened by the removable cover plates 33. These rollers may likewise be mounted upon eccentric pins 34 and their function will hereinafter appear.

A pair of supporting beams or arms 35 are extended outwardly in spaced relation from the back member I9 and are braced by angular brace bars 36 to stand rigidly in the horizontal positions shown, these beams constituting the draw table, as will be described. A cross member 31 at outer ends of the beams 35 supports the valve 38 to which the air line 28 is connected, and by which operation of the jack 25 is controlled.

A bracket arm 39 is extended from one side of the foregoing assembly and at its free end is forked at 40 to embrace the upper section 4| of a mounting bracket 42 secured by clamps 43 to the head supporting posts I2 at one side of the core blowing machine. A vertically axised pivot pin 44 is removably mounted through suitable apertures in the forked end 40 of the arm 39 and both upper and lower sections or bars 4I and 45 of the bracket 42 to thus support the device B for swinging movement in a horizontal plane with respect to machine A. A caster wheel 46 mounted beneath the foot portion 21 of the back member I9 aids in supporting the device but permits ready swinging movement thereof.

The bracket 42 is of heavy rigid construction and at the forward end is bifurcated to provide the vertically spaced bars 4I and 45 aforesaid and thus to provide bearing support for both upper and lower portions of the fork 40.

The frame I1 is pivotally supported on the and comprises elongated flat side bars 41 from medial portions of which are extended on one side the apertured ears or lugs 48 which are pivoted upon a cross rod 49 extended through the slightly flattened upper ends of the posts. On the opposite sides of the bars 41, also near the centers thereof, the brackets 50 are secured to support the core box mounting plate I at right angles to the length of the bars.

The core box shown in the drawings is of the horizontally split type and comprises a bottom portion 52 which is secured to the plate 5I and the top or cover 53 which is secured in inverted position to the sand container I5 of the core blowing machine. The type and shape of box used of course will vary widely in practice, and for convenience sake the bottom portion 52 will be hereinafter referred to simply as the core box.

An air line 54 of flexible nature is connected between the valve 38 and any suitable service connection of the machine A as represented at 55, and it is understood that the machine has all of the necessary air supply connections and controls usually provided although they are not herein shown.

In the operation of the assembly thus far described, the core blowing machine A is of course loaded with sand in the usual manner, and the container I5 lled from hopper I. The construction and proportions of the frames I1 and I8 and location of the pivot 44 are such then that the core drawing device constituted by the frames may swing outwardly away from the machine A, and in the position shown in Fig, 1 the box may be mounted on the plate 5I in position clear of the blowing machine. The entire device B is then swung inwardly on pivot pin 44 so that 75 box by air clamps such as the core box enters the machine A over the table I3 and to a position properly aligned with the sand container I5. The table I3 is now raised sealing the core box against its cover 53 or the blowing plate I4, and the sand is blown solidly into the box by manipulation of the blower valve on the machine in the usual manner. As the table I3 raises it of course contacts the mounting plate 5| :and raises the entire frame I1 along with the posts 2i and when the core is completed lowering of the table allows these parts to descend clearing the box and core from the sand container and finally clearing the table below the plate 5|.

The device B may then be swung as a unit outwardly clear of the machine carrying out the box and completed core ready for the next operation. This swinging movement of the core drawing device although carried out by hand in the set up shown, might readily be done by air power, by suitable connection ,of an operating unit (not shown) with the arm 39 or the like, and such modication of the structure is consid- 1ered to be within the scope of the present invenion.

The core as it now stands must be removed from the box and for this purpose we first place the usual drier plate 56 (shown in Fig. 6 and of course adapted in shape and size to the particular box in use) over the core and secure it tightly in place by inserting an elongated tapered pin or wedge 51 through a diametrical slot 58 in a central post 59 extended upwardly from the core box. The pin thus holds the drier plate in place, and the entire frame I1 may now be turned over, or flopped over, until the box and core extend out over the draw table formed by the beams 35. As shown in Fig. 5 the drier plate '56 (now underneath) comes to rest at this time upon removable barsor fillers 60 placed on the beams 35 and, the pin 51 being removed, the valve 38 is now opened admitting air to the jack 25 causing the same to move the posts 2| upwardly. This action raises the frame I1, causing the core box to be drawn from the core represented at C in Fig. 5, and the core on the drier plate may then be removed and placed on the drying rack for transport to the ovens. Relief of the air pressure in the jack 25 will now return the frame I1 to lowered, operative position, and

it may be turned over to again enter the core blowing machine to form the next core.

The entire operation of swinging the box into the machine, blowing the core, retracting the box, putting a drier plate in place, turning over the box, drawing and removing the core and returning the box to position for the next operation may be carried out smoothly and rapidly by the operator, and it will be apparent that even the heaviest and largest of cores may now be handled readily and quickly by one man.

The outer rollers 3| bear against the side bars 41 as the frame on the frame I1 is raised and lowered in either position and provide proper alignment of the frame as well as reduce wear on the side bars.

To facilitate the drawing operation, vibrators or knockers of any suitable form (not shown) may be arranged to engage the box and drier plate in well known manner. The draw table may also be equipped with equalizers of well known type for ensuring perfect alignment and proper drawing of the core. In lieu of the pin 51 the drier plate 56 may be clamped on the are ordinarily used in a horizontal axis',- a^- core box mounted on and core blowing and` drawing 'machinery;V The'. entire coreV drawing device-,- may be readily vremoved from' the machine by removing: they pivot pin 44', and byV use ofvv a suitable supportthe dev-ice may befutiliaedA as aV separate turnover andE draw machine.

vAs the corebox enters the blowing machine and the table F3:- starts t'orisathere is a tendency for' the box toL swing upwardly slightly on the pivot 491 The box wil-l of' course be leveledy when it strikes the: upper section 53, butl anuneven wearresults, and to overcome this we provide (Fig. 8`-) alatch G5 arranged" at the rear of the table i3 to engage a loop or' hoek 66l carried by theV mounting member 5-If. Asthe box is swlung intol the machine nowthisv hooki: slipsv beneath the latch E5 to' hold the' box in perfect` alignment with the table F3. The latch 65` isf carried at theupper end of an arm 6ll pivotally mounted at (58l on the rea-r side of vthe table and. spring set bycoi-l spring 69 to'stand in the position shown. However, this spring permits the/arm 61 to oscillate slightly as the hook 65 cams beneath the rounded end 'l-0 of the latch.

The latch-itself is pivotedI at 'Il on the upper end of the armv 61, but is-y normally held in rigid position by the safety shear pin l2. Should any unusual strain occur on the latch or the box fall thereon, this pin will shear off and the spring 13 will pull upon the latch to swing it into the clear upon the pivot 1|.

It is understood that suitable modifications may be made in the structure as disclosed, provided such modifications come within the spirit and scope of the appended claims. Having now therefore fully illustrated and described our invention, what we claim to be new and desire to protect by Letters Patent is:

1. A device of the character described, comprising a base frame, upright guide members at the sides thereof, posts slidably supported in the guide members for up and down movements, side bars pivotally mounted on the posts for swinging movements with respect thereto about a horizontal axis, a core box mounted on the side bars and movable therewith from one side of the frame to the other through a range limited by engagement of the side bars with the base frame, means for raising the posts and side bars for drawing a core from the core box in the inverted position thereof at one side of the frame, and means for receiving and supporting the core as the box is drawn therefrom.

2. A device of the character described, comprising a base frame, upright guide members at the sides thereof, posts slidably supported in the guide members for up and down movements, side bars pivotally mounted on the posts for swinging movements with respect thereto about a horiy zontal axis, a core box mounting means secured to the side bars and extended at right angles therefrom, a core box secured to the said mounting means and movable with the side bars from a horizontal position at one side of the frame to an inverted horizontal position at the opposite side, means extended from the frame for supporting the box in the latter position, and means for raising the posts and side bars and drawing a core from the box upon the said supporting means.

3. A device of the character described, comprising a base frame, upright guide members at the sides thereof, posts slidably supported in the guide members for up and down movements, side bars pivotally mounted on the posts for swinging movements with respect thereto about extending from' the side bars"` for movement therewith oe sildefof t'hel frame. through a verticaf plane to the other side to'- thereby invert the box, a. table. extend-ing from. the base frame for supporting the corey box in the inverted position, and a/-jaaclconnected to the base frame and the postsy for' urging the. posts.- upwar'dly and drawing-` theinverted corel box` from the table;

4. A- devie for-mar'r'1lpulating. acore box, to

l'turn-i' over and' draw' av core therefrom, compris- 'irig-4 spaced 1ipright guide members, posts slidably' mounted spaced' relation in the guide posts, and 'for engaging Ythe side bars in their upright; position at? either side: of the guide members, and means for vertically adjusting the posts and side bfars with respect to the guide members.

5. A device for supporting a core box in a core blowing position and for inverting the box to draw the core, comprising a supporting frame, a carrier frame, means for mounting the core box in the carrier frame, spaced upright members mounted for up and down movements in the supporting frame and pivotally supporting the carrier frame for moving the core box from core blowing position to inverted core drawing position, means for rigidly supporting the core in the core drawing position, means for raising the upright members and carrier frame to draw the core box from the core, and separate guide means in the supporting frame for engaging and guiding the upright members and carrier frame in their up and down movements and in both the core blowing and drawing positions of the parts.

6. The combination with a core blowing machine for forming a core in a core box and including a table, of a core box supporting and manipulating device comprising a carrier member pivotally supported at one side and having means for mounting the core box, means for swinging the carrier member into the machine to move the core box across the table toward the rear side thereof, the said carrier member having a hook member on the side opposite to its pivotal supports and adapted to come to rest adjacent the rear of the table, and a latch member carried by the table at the rear thereof for downwardly engaging the hook member and holding the core box in horizontal alignment with the table.

7. A device for supporting and manipulating a core box, comprising a frame having upright guide members, posts mounted on said guide members for upward and downward movements with respect thereto, means for raising and lowering theposts, side bars pivotally connected at medial points to upper end portions of the posts and movable upwardly and downwardly in connection therewith, means for supporting the core box on the side bars in a position substantially at right angles thereto, the said side bars being movable from upright positions with one end in engagement with one side of the guide members to a turned over position with their other ends in engagement with the opposite sides of the guide members to thereby invert and revert the core box carried by the side bars, and the said side bars having guiding engagement in either position with the respective sides of the guide members as the post and yside bars move upward and downward. f

8. A device for supporting and manipulating a core box, comprising a frame having upright guide members, posts mounted on said guide members for upward and downwardl movements with respect thereto, means for raising and lowering the posts, side bars pivotally connected at medial points to upper end portions of the posts and movable upwardly and downwardly in connection therewith, means for supporting the core box on the side bars in a position substantially at right angles thereto, the said side bars being movable from upright positions with one end alongside one face of the guide members to a turned over position with their other ends alongside opposite faces of -the guide members to thereby invert and revert the core box, rollers journaled in said opposite faces of the guide members for engaging the ends of the said side of, a hook member on the core box mounting means, a latch adapted for downward engagement with the hook member to prevent upward movement of the core box relative to the table, means yieldably supporting the latch to permit its engagement with the hook member as the core box swings over the table, and a shear vpin arranged to normally but releasably hold the latch in position for engaging the hook member.

NEIL M. GOLDBORG. OLAF H. SKOGLUND. LOUIS W. WILLIAMSON. 

